1. 

What should come in the place of question mark (?) in the following alpha numeric series?

1CV, 5FU, 9IT, ?, 17OR

A. 11LS
B. 14JS
C. 15JS
D. 13LS
E. None of these

Answer: Option D

Explanation:

Pattern of the series as shown below

letter-and-symbol-series-logical-reasoning-practice-level---letter-and symbol-series-problems

Hence, the missing term is 13LS.